In these drawings the piston replaces the elephant, we use valves in the cylinder head (top of the engine) to let air in and exhaust gas out.įuel is injected through the green component, called a fuel injector. Just about every small boat engine works on this principle. No electricity is required, except to turn the engine over fast enough to start, which can be done by hand on a small engine.įor a real engine fitted to a boat, there is no elephant and we need to get air into the engine, exhaust gases out and fuel in at the right time. If the air is heated to above the combustion temperature of the fuel very rapidly AND if the correct amount of fuel is injected into this hot air at the correct time, the engine will run. Very simplistic, I know, but the basic diesel engine is as simple as that. There’s only one inevitable outcome: the elephant gets a free ride! And let’s imagine that, at the same time, an archer shoots an arrow full of diesel fuel aimed to arrive at the bag of air at exactly the same time as the elephant.Īs the bag of air is very rapidly compressed by the arrival of the elephant, the arrow with exactly the correct amount of fuel arrives and penetrates the bag of now very hot air. Let’s imagine an elephant jumping from a height onto a bag of cool air. This practical, hands-on guide for troubleshooting your diesel engine problems is highly recommended, says Julia Jones
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